Ok guys. This piece of code will add attachments list after post excerpt on all archive pages. Paste this into functions.php of your themes and modify according to your needs.
function downloads_after_get_the_excerpt($excerpt) {
if (is_archive()) {
$excerpt .= da_display_download_attachments();
}
return $excerpt;
}
add_filter('get_the_excerpt', 'downloads_after_get_the_excerpt');